Use of a polethylene-based film in a photovoltaic module

A film composition for use in a photovoltaic module as a backsheet or as an encapsulant, said composition is polyolefin-based and comprising with respect to the total weight of the composition:

• from 1 to 99 Weight percent of polyethylene A having an ethylene whose level by weight is greater than or equal to 80%, wherein said polyethylene A is either a homopolymer consisting of ethylene monomer units, or a copolymer consisting of ethylene and one or more monomers is selected from the group consisting of propylene, 1-butene, 1-pentene, 3-methyl-1-butene, 1-hexene, 4-methyl-1-pentene, 3-methyl-1-pentene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, 1-docosene, 1-tetracosene, 1-hexacosene, 1-octacosene and 1-triacontene;
• From 99 to 1 weight percent of a polyolefin B, other than A, carrying a reactive functional group X chosen from carboxylic acid anhydrides and epoxides, and containing from 60 to 99 weight percent polyolefin.